1 00:00:00,000 --> 00:00:05,000 The answer is our initial constraint would touch this guy over here. 2 00:00:05,000 --> 00:00:08,000 The one to second motion touches these things over here. 3 00:00:08,000 --> 00:00:13,000 The second to third, these guys, and then the landmark observation over here 4 00:00:13,000 --> 00:00:16,000 puts something between x0 and the landmark 5 00:00:16,000 --> 00:00:21,000 that sits here, here, here, here again, and here. 6 00:00:21,000 --> 00:00:25,000 This observation over here puts something between x2 and the landmark-- 7 00:00:25,000 --> 00:00:28,000 these guys over here and the guys over here. 8 00:00:28,000 --> 00:00:32,000 That means we have only the following places that are still 0. 9 00:00:32,000 --> 00:00:36,000 This means there is no direct constraint between x2 and x0. 10 00:00:36,000 --> 00:00:39,000 That is, there is no direct motion information between these guys, 11 00:00:39,000 --> 99:59:59,999 and there is no direct constraint between x1 and L, which is this guy is missing over here.